Help me out

So I’m supposed to be 7 weeks and 2 days at midnight. I just had a internal ultrasound done cuz I’m having bad pains and the baby is measuring a week behind and the heart rate was only 93. Should I be worried? The tech said it could be off a little cuz of how small it is for the measuring and the heart beat. My HCG levels are like 21,000. Is that good??